For me, it's not worth the hassle to try to turn on and off the travel pass or text to call later. My kids know I'm in SXM and rarely call unless it's urgent. As when I'm home, I don't answer numbers I don't know and if I don't think it's urgent, I will text or iMessage when I have wifi. It's worth the peace of mind to me to have my phone available, not just for my kids, but my parents are getting older as well. Like you say, everyone's different, but it is worth the very minimal charges to me to not have to worry about it. All I do is turn off Celluar Data when I get on the plane for SXM (or anywhere) and turn it back on when I get back to the USA.